Which of the following screens has the maximum capacity ?

Related Mcqs:

1. With increase in the capacity of screens, the screen effectiveness__________________?

   A. Remains unchanged
   B. Increases
   C. Decreases
   D. Decreases exponentially

2. Vibrating screens have capacity in the range of ______________ tons/ft2 .mm mesh size?

   A. 0.2 to 0.8
   B. 5 to 25
   C. 50 to 100
   D. 100 to 250

3. Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the ___________________?

   A. Light metal powder down upto 4 mesh size
   B. Dry chemicals
   C. Heavy tonnages of rocks or gravel
   D. Powdered food & granular materials

4. Trommels are revolving screens which normally operate in the range of _______________ rpm?

   A. 1 – 2
   B. 15 – 20
   C. 40 – 50
   D. 60 – 75

5. For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately _____________ microns?

   A. 5
   B. 50
   C. 500
   D. 5000

6. Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of_____________________?

   A. Electromagnets
   B. Cams or eccentric shafts
   C. Unbalanced flywheels
   D. Either A., B. or C.

7. As per Taggart’s formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms) ?

   A. LS
   B. 93 LS
   C. 250 LS
   D. √(LS)

8. For achieving maximum capacity of the ball mill, the ball charge should be equal to about ______________ percent of the ball mill volume?

   A. 10
   B. 25
   C. 50
   D. 75

9. Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m3) ?

   A. 3.6 W.D.V.ρ
   B. 3.6 W.D.V
   C. 3.6 W.V.ρ
   D. 3.6 D.V.ρ

10. The capacity of a belt conveyor depends upon two factors. If one is the cross-section of the load, the other is the _____________ of the belt?

    A. Speed
    B. Thickness
    C. Length
    D. None of these